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ABSTRACT

OPAQUE VOIDED FILMS HAVING A TOTAL LUMINOUS TRANSMISSION NOT EXCEEDING 25% ARE MADE FROM BLENDS OF A POLYESTER PREFERABLY POLYTHYLENE TEREPHTHALATE, WITH 3 TO 27% OF AN ETHYLENE OR PROPYLENE POLYMER, PREPARED BY DRY BLENDING. THE FILMS ARE PREPARED BY BLENDING PARTICLES OF THE POLYESTER AND POLYMER, AND THEN EXTRUDING THE BLEND AS A FILM, QUENCHING, BIAXIALLY ORIENTING THE FILM AND HEAT SETTING. THE OPACITY IS THE RESULT OF VOIDING WHICH OCCURS DURING THE STRETCHING OPERATION. THE VOIDED FILM MAY BE USED AS A BASE FOR PHOTOGRAPHIC PRINTS.

DEFENSIVE PUBLICATION UNITED STATES PATENT Iubllahed at the requeat atthe appllrant or out r ln a etraetl ot Delenalre Publleatlouappltratloua are ldenttned The headln: 0! each atntraet tndleatel thenumber 0! page. of tn the applleadon an ortetnally nlrd The lllea ofthenan ma be purehned [or 30 cents a abeet.

Detenalre Publteatlon applloatlont hare not been examine armrdanee Iltbm Xotlee of m. 1'0. 1am. non 0.04 r.

by dletlnetly numbered AND TRADEBIAIIK OFFICE R7. The

urtee and are arranged ebrouologtcallr. epeelheatlon. lneludlng elalrmand aheeta or drawlnge eontalned plleatloua are arallable lo the publlc(or lnapectlon and reproduction d an to the merttl of alleged tnventlon.The Patent and Trademark Olllee makes on abortion as to the novelty otthe dtaeloaed lublert matter.

PUBLISHED DECEMBER 2. 1975 Gordon Edmund Alfred Penn, Dullield. Klmpton.and Peter George England, astlgnors tn lrnperlal Chemical Umlted.London. England Harpenden. Alan Knowles. Luton. Industries Contlnuatlonof abandoned lpplieatlon Ser. No. 407,950,

' Oct. 19, I973. Thls applleation 531.000 Claims priority. appllcatlonDec. 9. 1974, Ser. No.

Great Britain, Feb. 9. 1973,

6.396/73 lnL Cl. G03e 1/78, 1/96 US. CI. 96-87 R No Drawing. 18 Page;Specification Opaque voided films having a total luminous tr sion notexceeding 25% are made from blend ansmiss of a polyester preferablypolyethylene terephthalate, with 3 to 27% at an ethylene or propylenepolymer, prepared by dry blending. The 1i ticles ol the polyester anblend as a film. quenching.

heat setting. The opacity is occun during the stretching operation lrnsare prepared by blending pa:-

d polymer. and then extruding the bialially orienting the film and theresult 0! voiding bid! The voided film may be med as a base forphotographic prinLs.

